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LM8333 Datasheet Keypad Controller

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: .. LM8333 Keypad Controller with I/O Expansion and ACCESS.bus Host Interface September 2006 LM8333 Keypad Controller with I/O Expansion and ACCESS.bus Host Interface 1.

General Description

The LM8333 is a general-purpose controller for matrixaddressed keypads which provides an ACCESS.bus (I2Cpatible) interface to a host microcontroller.

It offloads the burden of keyboard scanning from the host, while providing extremely low power consumption in both operational and standby modes.

It supports keypad matrices up to 8 x 8 in size (plus another 8 special-function keys), for portable applications such as cellphones, PDAs, games, and other handheld applications.

Key Features

  • n 8 x 8 standard keys n 8 special function keys (SF keys) providing a total of 72 keys for the maximum keyboard matrix n ACCESS. bus (I2C-compatible) communication interface to the host n Four general purpose host programmable I/O pins with two optional (slow) external Interrupts n 16 byte FIFO buffer to store key pressed and key released events n Error control with error reports on (FIFO overrun, Keypad overrun, invalid command) n Host programmable PWM n Host programmable active time and debounc.

Similar Datasheet

Brand Logo Part Number Description Manufacturer
Texas Instruments Logo LM8333 Mobile I/O Companion Supporting Key-Scan Texas Instruments

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LM8333 Distributor